books.google.rs - In this engrossing and accessible book, Doug Macdougall explores the causes and effects of ice ages that have gripped our planet throughout its history, from the earliest known glaciation—nearly three billion years ago—to the present. Following the development of scientific ideas about these dramatic...http://books.google.rs/books/about/Frozen_Earth.html?id=W2eDDMIeqpoC&utm_source=gb-gplus-shareFrozen Earth